Optimal growth and thermal stability of crystalline Be0.25Zn0.75O alloy films on Al2O3(0001)
Optimal growth and thermal stability of crystalline Be0.25Zn0.75O alloy films on Al2O3(0001)
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DOI：
10.1063/1.4870533
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发表时间：
2014-04
影响因子：
4
通讯作者：
Dae-Sung Park;A. Krupski;A. Sánchez;Chel-Jong Choi;M. Yi;Hyun-Hwi Lee;S. Mcmitchell;C. McConville
中科院分区：
文献类型：
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作者：
Dae-Sung Park;A. Krupski;A. Sánchez;Chel-Jong Choi;M. Yi;Hyun-Hwi Lee;S. Mcmitchell;C. McConville
利用同步辐射X射线散射、高分辨透射电子显微镜和光致发光测量研究了生长温度对在高失配Al2O3（0001）衬底上生长的BexZn1−xO合金薄膜合成的影响。在生长温度Tg = 400 °C下获得了Be浓度为x = 0.25的单相BexZn1−xO合金，并通过高分辨率透射电子显微镜进行了验证。结果发现，高温生长，Tg≥600 °C，引起相分离，导致混合合金相的随机分布。在高温下生长的BexZn1−xO薄膜中观察到的不均匀性和结构波动归因于通过原子位移和应变弛豫的Be成分和镶嵌分布的变化。
The influence of growth temperature on the synthesis of BexZn1−xO alloy films, grown on highly-mismatched Al2O3(0001) substrates, was studied by synchrotron x-ray scattering, high-resolution transmission electron microscopy and photoluminescence measurements. A single-phase BexZn1−xO alloy with a Be concentration of x = 0.25, was obtained at the growth temperature, Tg = 400 °C, and verified by high-resolution transmission electron microscopy. It was found that high-temperature growth, Tg≥600 °C, caused phase separation, resulting in a random distribution of intermixed alloy phases. The inhomogeneity and structural fluctuations observed in the BexZn1−xO films grown at high temperatures are attributed to a variation in Be composition and mosaic distribution via atomic displacement and strain relaxation.